Calculate reaction time based on the distance a ruler falls before being caught.
Test Parameters
Reaction Time
Enter distance fallen
About this calculator
Quick Reference
tTime (s)
dDistance fallen
gGravity (9.81 m/s²)
Overview
The 'Ruler Drop Test' is a simple and common way to measure reaction time. A partner drops a ruler, and you catch it. The distance the ruler falls can be converted directly into time.
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Pro Tips
Ensure the ruler is dropped vertically without any initial velocity.
The formula used is t = √(2d / g).
Average human visual reaction time is around 250ms (0.25s).
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Fun Facts
"Sprinters are allowed a reaction time of at least 100ms; anything faster is considered a false start."
"Auditory reaction time is generally faster (approx 170ms) than visual reaction time (approx 250ms)."
"Fatigue, age, and distractions can significantly increase reaction time."
